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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c041a77693cab218408175a8dcec7000f52e9f67b1a87f76b0dda6889c090272' 
  AND token = 'F+zIN5aWU0m5xkc3NV4JAgWjYcUsGLtXBa7AHEpTosw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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