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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '807e2632c7fefa81a2ed365ef9b462d42c3be4d734635d3b047ff9693ed1136b' 
  AND token = 'cTal2zTa8wTtiO7mrEDGh6hK7udNfg/qgmpjpbHa6jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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