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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2941cafde117937928358262120c157f61fffd0bda7f2fd909a907b1b4caa419' 
  AND token = 'RaPek5Js5Rhg7P87Z2zEI0uT7r8UQajAMSAirHS48kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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