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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a0763a80a485940c372c8e85acdf30779bc5d47ae6961fc4a2a7b33fa21f745a' 
  AND token = 'IOj3qb61Axr2HDhOU0hsM5W89FmvXsMAr7t47Pvilkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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