Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c3a99c1d5adca9f2240fd08c875493a31f9567fd6170ac6a1971c0e51d79fa1' 
  AND token = 'jxSTAV9yyXuBc2zXYkCG62+tv+6kI4VvGcOpTLELEGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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