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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c20cb466ef0d24d6d3aa171784c4b9be6788ad8abdd7dc0f9f679d462c24e963' 
  AND token = '3IZT1Zfurh59F6o5HgTmX7cf0vQyowLXSDAiWnuNApE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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