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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3f71e745c02567e667d984d1fcac37e1d1e92144efc0d3becf32e176a794039c' 
  AND token = '4t2YYU+b5clKTEd6vkBusRk2aB/fDSQJa/XWOukxGbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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