Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5ac31c99e5d2ddc37e0c55484c4d4e39a62ff829977252ec3408d5cf7557e7' 
  AND token = 'c8ZDDzklCRZrl3guHEB80uD60nTpNNpI0n18CBody4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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