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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5fd4475923a3760bfca0c1454ea1a0dee1e587f4a38bbd9580ea3df966d926d7' 
  AND token = 'Fny6K8XofLLl1uAL2FXxjmOjBhFXMaFj9aNQxDMRt5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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