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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd285860bb4572da3021dd0dfa51c26b40219061f8665b1e0c2d2b7255a1ac2ad' 
  AND token = '2h5wQmmG1q1xcQR95ava1bxLtM87yoBHR0lqRQZunkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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