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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7cc7bbf6f596a43f9a4f561ed32fb7b2a88f1744c4e35fe454a7a601b95a0e5e' 
  AND token = '6mQHoMZKTy2ImYckEnG5itbfy2FPTP6g+oQO8NLVGUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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