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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b858f1eb28d87f4927390d58fcefd26cbd70147a48b54ef0fdc89d63c46c3c66' 
  AND token = 'o8x4m0Dd7q0sncuv4brGpaATIat1JFVlHGxSj8TImII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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