Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e645e77a6aa2bfe45e5d69943d1f6f7366d5098ddfcdff3ab4d8907b1965bb59' 
  AND token = 'AfKXERLCfM4N8+p3wuy5goiSjlUUq5CezHE6j4EZHL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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