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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7dac57e419f7dc23233f95653111d7a26c62e53856b85916bac91ccba87f136f' 
  AND token = 'vnK1kUAGSkr+G+Ww57FhrOQdt1oVR2N40NpSpPk5dXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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