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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c4ccf976ac5c9c4a3a3d8bf8c2f89d0cfc9a679c5d475eb2cc306e8bac435e01' 
  AND token = 'oPQZTAzujclcHpK1HEGzOQW8lvnpAok5JhxSku3eRfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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