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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6da4a555585415addc81c1cadcd84960be02e60147bbd15aa15a336eeb332ab5' 
  AND token = 'S/f1iIuJbHBOwl1Dk8lcSIzt/+qgb0eWS5e54v4RSY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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