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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e73a94b16bd823a0802a9e25b630f78d8a46f46ce16cdd441b4cc7ab051f1214' 
  AND token = 'KSDqQDbn858YaN6kPoejouFCoAnCYTuq2tcp2raaLr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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