Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329d1b9799a7e79c270cdc512478007c9b34de5c9bc30b3e30fe389b15f86273' 
  AND token = '/8aBQd0OoUB6ISm2TeJADIV45ZkoAVoICRZW5RMdEqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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