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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '96b85f54c2d7c8c284d40d8aa213841d60ba034237cee163e4bb14a49ea8b0d6' 
  AND token = 'RbvQKmsa/ZI5mdw17M7Oo3bApzDowLcRwJDGEB+lQcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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