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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b18fc41e0d3c7daa9039ef2f2ec8e0563dc7663d0148dbd8f34ad5116bc23442' 
  AND token = 'BGPi1NhfqEmEyrKHnjGHf8J6KfqLHFH1PdC4B/b6ILE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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