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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd5335d4ba9ee5e13afa681ad6aaad41bd933a5a82407449385e7d9362dc9d03b' 
  AND token = 'g9zIdNTlHX4P23zaADUgvge+oVeKJmkgz//L7BhxTjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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