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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'df12133578f8eb08f3aebfe57d45c7615cef1227db61b3ccfd7c8e572f58e08e' 
  AND token = 'fEStYDxuPUUlDbFUMN/lawoY+yeiJg86lBEfrbxkUCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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