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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8f8083b79781daf2cb97808e6d3c85267638c94a337f88db4b70e406153023bd' 
  AND token = 'odveWFetkcNkmJpASJ1miMe6wDQPBrlt6hH58X6K9wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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