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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5a47c879941c7d80f7146715b0ffcd6681e764f524787b7714cfa15331d8fdf8' 
  AND token = '0aTBy7OGpkUGk8JbXU+gym7xPD2Dg2ST0e5O0hopAhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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