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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '94dcc592d0154335cc42a3396b1b5bf2b905f1a3651251c5a19d1a0e51a07304' 
  AND token = 'omllXceZ5AqPAW5xAay79drgDuhRW/N5+gQxxZ9vx5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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