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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3a35add8deee40b06fef14d87de869a687565f45e29270cf02fabf23547a4076' 
  AND token = 'A0tCqiBaX6tXGyzPFPFm8JmWlknEV93f6+bIBBSCscA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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