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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ee5ef5c12bb76dc9e84b21be240d975d1e0b7ec50ee0eb519db906e43e0664ff' 
  AND token = 'AlWX7Yrr1HD6P6W+S8E1MUU/tojUQB8Jyr3oc1qxAl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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