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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b913dbcf7393820d98784e879abde92f74d9f08221fb38b5f4c9ce11e2eee6f3' 
  AND token = 'icJN1gz+bxWTtYoXeCPatIpwikCpt2WPBE4QoK2vWsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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