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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e11969b5daca05851887556e660b27a97ceafb543ec2efeed05c515b1b3832f' 
  AND token = '8WLkYpUFPXLZLegila8G8bJzRlmGiPl3cem4oPDu4zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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