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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4e85e4b16f789627018d5b70381e09f4017343e75a89b3e52d36941cf50aad34' 
  AND token = '0k5uAvUps16xmRDwCEnQieG9GMbBOkIPNoraL1X/iCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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