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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a624986ea5209e7ac54a6236cef838ee0c4f3592758e4aaa7f3b3b06f4f4f397' 
  AND token = 'h0s7DCh0mSRyZdQsh5MUXtmXNdtb8Q/VKNe28sytc64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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