Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a5ac7fd82cea8dccf75c5c79729dac02e82f79f03e2de71f75663d1d1e4d63e' 
  AND token = 'HfjX2EHpuFPR5rpZjjcrQjrypDtTf4YrLu4GvQhYORA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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