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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '624d597e4d86fdbf2d814945e446d3d06e9fa12ae94275402ae5703676b48d44' 
  AND token = 'r/Lxmq9oj3/srRaNIRH4VxG28Weru5QP20k8kwLbJyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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