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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e314c5119a4deb3e776bef5ad7610de5bd181dbed4aa0349478bcf6d7650fb67' 
  AND token = 'YbJMBixMdKowq0Ah5WkRSAOzgkVVMpbA/xsA/jL6fnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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