Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c52699e376efc2ce71b743a393db6d9159b6c0dcd4c424b52f3e4d9c12dda58' 
  AND token = '4W2t2R2EI91gXRXeF+Xf2L1gHNfkbqXdly49AaCVT5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}