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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9a58e2f5bd692a8b4985fd8f096d06f79fc3e823a4375fd461f64e130015f3b1' 
  AND token = 'h7nAAy9pU1zm933/Rk7A5o2zODPnIVDu1ylyFyVZPoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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