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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ab669d1ea7f47462d86c6edd48211066687bbf1e4c78e206c77d80c6655ee8ef' 
  AND token = 'U6OAZlwELoC+ySA810upEuTwy3CJyFG7JTVPA29yhMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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