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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'af66d9985418a0535157db426cea82bb6860ca9e169ec76a8bc3292a79ea2354' 
  AND token = 'd40cvn9MrhLOKs40k3G8p6u/Q6tbjS4/rN1jNsuBGbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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