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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1d3cc3fdccafdf145dc7c4534c3e2d4af408e30bb631397b9c4ba8617c093751' 
  AND token = '+VfT7kmN0i0hr/Yubnirh+VZp9P79iboALLFGtsZWs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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