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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fc4265f92cb8833751c7ab8c45cbe6c771385a41fafdd1ad7bcf0385d32e6b49' 
  AND token = 'S2qJ5eAUr8hMW8ELp+GXNbLvSk3+W+Mfgj7HDN7uxKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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