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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '306d2cca2421b1c66dd7d43ef468c64d4bceb9ba7ef063af6c08563fc0395236' 
  AND token = 'FJB7wWKcKkv8TS72O2eUhokgnvCzwbhvv1XA8eUdur4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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