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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'be8d9d70d068bdca086eab2ecd90722cbeb3e7e7b45b2f31a670ae1e2b0c7c41' 
  AND token = 'tfQwnX+TS7dg+yM5qEG/CFKNAIx/i8ncIIrQ4QvXt9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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