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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a5995487fd144d200aa1d3eaa55c2f71ffeccb330d9e0c366564cc3005b814ec' 
  AND token = 'vii7XZ4VSv0tcHow47ttjxClGqD/1elOrtXx/TiNDUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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