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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e2ec9f258d7792328c20d3d1957acd4e23eb0f1dabb8401a8fd0225d5805b42f' 
  AND token = 'Q4GAKt3JtkVXW1d0YncQTdxm9icThu5/0zzKKR8vkr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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