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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3bf94163f29165e0629756f8741561927f5d0ee047745551bdadb30841ffd28f' 
  AND token = 'ly+vt6IVH0Alx4YFggfkHdKX7GekUf1PHRIUAFsf4hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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