Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98c1c19f2b0344a31478278bdfb27d7fc46a35648881921d166d6a90f3a063eb' 
  AND token = '6VtZW5+8ZuNTm83Jczlw0p7ieGnT391AZW+IDCY3m58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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