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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e3946ad767403378867e3cebfc4342cf17a4b5213b0b86631501c8dc37dfc89f' 
  AND token = 'OYQBaF7bd7qz4iRKIb9LacQZQp1W2tNQJQET+U3Osyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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