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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e7d50809cf1741eff91280b062068d485b1b5f250877ba9f1565da91d6c88eca' 
  AND token = 'Dfakptr6WH8U2tJiN5KeMxJgJEGc+mKSkG3kJgTXZFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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