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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cfbb6cdf5762a6d92532647588f0e586e0e22f25d2c06ed00034a3b8c07e0e1d' 
  AND token = 'zdffXIkkqnXktRsdNxozdHsuC49uN8eu8WwqzLzeUzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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