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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7d484a74bf9a5724023a114f7f49c370a4ab06b62a23bef6da4e6eec12b18ebf' 
  AND token = 'CAHOu/HRSrpsmy1JR8+Ne/Y7CJo2Yy8AyVSL2hU8x6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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