SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '69b4303f504256d13408da5e1ada0d8fb5532cd2f746e262b1d91b68d2234d07' 
  AND token = '7vP3Twm5p4rpYmX6CeGwffg+EvQJH+G/RaoGy39J2jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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