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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '31369333da3f5bc104315e30a1676d6e3cf786324d3b0ee92038e630fbef4836' 
  AND token = 'FWLgw0bvAidUfKVI3/G1GCpKxNAOTz5wdKE+8UD9PNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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