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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7acf8947c249a36fddead12e143b0c29ede9c9bd29e23cb932f78302acd1b182' 
  AND token = 'qHfUw2cCx2PkWJDNJzIZ1GWIoiDmbhgxFn97LpA+rIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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