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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '84842d5d51503082963e3411d0cf0c2bdeddf12c4d9a3999fad9f1661345b4ea' 
  AND token = 'Wu69gbW3fNuCpTkGVCS8f9+mqbSQqrcSpzd4BhpRqfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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