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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '01db29f907b7e3a2c43d18599f263fa1cccccf3eaf97341ecc495143d20209fc' 
  AND token = 'fBV/nE5gvFBsb6/C4/EAort3W6QLk9i00DraRVVbtmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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