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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e2c8b08e4a3aee256f18c43cafd1a3d3e969cac43da245414ecdf22dfa6b2e47' 
  AND token = 'ncef1tO8fDCJQ9EyZQz2VGGjV9RApn83RSTimyTsKKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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