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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e8c57e588e9418fbb783c6594e93ddccd7615804f12be847b06d750c69fd40ed' 
  AND token = 'Zmp7E4SzAQp8wcFzEnRNsN5EdSbarQDUAVPz6G41Buc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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