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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '61c0e99f8291455782b507c3ce1e1d2870cca7319be973b3d4bbecc47376c91a' 
  AND token = '/9SYYqZQX5pYE+OZ2Op0Eip0+IWAG6zLPPYgIpUUy0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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