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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2a52074d622810de537a2abeeafcefc5296b07d5c1ab5695f62979e087894e86' 
  AND token = '+eIk3eI6qiccLddChCdqZ7LNDuHYGBrx/J2LWRakl78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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