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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '39d73ed4c7383676ef142b6d55ef57a1c0e5541da355f43c3bffac74c6a07f28' 
  AND token = 'qcNh5sTNlUDbLTL78dBViT8J0X0JOqQ9LaxcFi7ebWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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