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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '608fa0d64d3211f57083068cdc3432be655dadd61c6f4c4db86b6e09ae759601' 
  AND token = 'snYb5C8HSIu2xOhT1U9aVx/xil+diQNH+v3uROKN58Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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