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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '56d5215b7617fa25e138dd38c467d195a3323857f117453574e429ef25a2ffb7' 
  AND token = 'SfcDcGfq7P4UJujsjooyveB9O2vfK9CVOmT6Bqt8LCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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