Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7689b0f7d3f844fc92cb6eaaa7d00b19bc3bc8ca1587289deed4eb29dd0daf38' 
  AND token = 'okruxbiicSPur1WoiQ2TAxlbpCpwzI2tEeOcgic+4+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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