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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '609901c90aabb514f17018868e9d963a78fd480536a74f3c21f28b6ba2fc4dc8' 
  AND token = 'G2rEo0xWfjcSdD44Lmn7c//umppR8bNYE37xw4Vp8n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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