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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9f496a8e237ebb5d53b476656dea3e37838f3f907d4827a75440e17c96c0764f' 
  AND token = 'OPbnOwgeC8bXwywbBvOXpka4kGbPZBe0Zh9fII4ybTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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