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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5d5b5f40658f7fbc7597fef57d9aff4fe0dfe5234a56f4444c615fa0cef8cca2' 
  AND token = 'YUl7LoOoZgzJwoEf9J2cYxNDYvvx5a2k7Nq9lQc8e0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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