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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '190bad2f03c7ca54cedd2e01a7107dfb6d972a718383dca00a10193a282cdaf9' 
  AND token = 'LJOEQYfyY9rSINQOW7OfM8BjuPM5IzpD9OPLFDAX4FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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