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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '05660b7a974b1769353b5cccfd65d49b87c81226d2af3cad5d9e48f08e278fd7' 
  AND token = 'y8A48cvug2HgF74WQkSHBW3nRRXhwESIpxTCuLXTfs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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