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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8e91c15c3960393515898699e6c4984acd004f32320d293810a9d9c828a805ec' 
  AND token = 'pwQAxYW3saDgFgIQWN9rqiili2QmrVfj54KS4Ag9zhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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