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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f282cbe70a26c86f4082e66ae0fca69ebceed5a55342017a8654bd604d17157e' 
  AND token = 'LDmGNnZnAp3g7vsA0GgIOga38FGsYMYu7qgJSdM4se4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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