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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '134c77809ebfa25d647475c4b94e0f33494c8fc2beab258b92c09d1e7b5a3a6e' 
  AND token = '0bCNQEje8onvD/z7/gQz0q3lfbcnVmZ0sK2Xx4qrx8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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