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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6011933aae2dc4e68ebbb40639486421a22582f8e326f79df1019b14728979ad' 
  AND token = '6NRMPZHf28vPtL2S3YaNxJIio/a465iXH+y0SHXCgqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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