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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '92c4603c59a4c658597112f82a96963e9f18db76badf8095d8070f8889784747' 
  AND token = 'DSSDNiDs9Ghb2L2n8QPak5k/m1lKRgHSHgglqDtAquA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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