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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e470c2c2c91a04a6e86b3024c3dc3c85dcebfc330762b7f242424d2372d3928' 
  AND token = '5OZqCZi/tjSlCzN834vWM1Np4ixdLyjCJc6O3l+wRNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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