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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2d554dfdcb3a12bfb4879038c2628cebcd94519ec939b7cf66b2c47c638b685d' 
  AND token = 'TfJE/8yu1nwKMSnHLI5h7eHtn3EIhhCNMtTHxu7MSWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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