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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '05d13ad212155be4910dbde846db4abce4d9203c6a2b5c2c73a96da5242c07f7' 
  AND token = '2lAQXttmkCbvbAZpMSWCqvHfrNc8BCaADExuKcjrfms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00144

JSON explain

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