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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '534de54ea43a782b534067873e6028432ac71fe64ed65b15c6f817c69c069d15' 
  AND token = 'kz3lNF32I3SglvUBL4hMs6UIStPqj99rj4pS1/wqai8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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